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A031396
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Numbers n such that Pell equation x^2 - n y^2 = -1 is soluble.
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11
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1, 2, 5, 10, 13, 17, 26, 29, 37, 41, 50, 53, 58, 61, 65, 73, 74, 82, 85, 89, 97, 101, 106, 109, 113, 122, 125, 130, 137, 145, 149, 157, 170, 173, 181, 185, 193, 197, 202, 218, 226, 229, 233, 241, 250, 257, 265, 269, 274, 277, 281, 290, 293, 298
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| Harvey Cohn, "Advanced Number Theory".
D. Khurana and T. Y. Lam, Invertible commutators in matrix rings, J. Algebra and Applications, 10 (211), 51-71.
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..1000
S. R. Finch, Class number theory
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FORMULA
| Terms are divisible neither by 4 nor by a prime of the form 4*k + 3 (although these conditions are not sufficient - compare A031398). - Lekraj Beedassy (blekraj(AT)yahoo.com), Aug 17 2005
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CROSSREFS
| {1} U A003814.
Cf. A031398.
Sequence in context: A020893 A145017 A003814 * A003654 A047617 A190437
Adjacent sequences: A031393 A031394 A031395 * A031397 A031398 A031399
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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